3.1 FIGURE 3.1 below is an illustration of a manhole - NSC Civil Technology Civil Services - Question 3 - 2019 - Paper 1
Question 3
3.1 FIGURE 3.1 below is an illustration of a manhole. Study the illustration and answer the questions that follow.
3.1.1 Describe the difference between A and D wit... show full transcript
Worked Solution & Example Answer:3.1 FIGURE 3.1 below is an illustration of a manhole - NSC Civil Technology Civil Services - Question 3 - 2019 - Paper 1
Step 1
Describe the difference between A and D with regard to the flow of sewage.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The sewage flows from point A into the system and exits at point D. Point A is where the sewage enters, and point D is the discharge point where the sewage leaves the manhole.
Step 2
Identify B.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
B refers to the pipe or channel that directs the flow of sewage between the different points in the system.
Step 3
The benching (C) must be installed at a slope. Give ONE reason for this.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The benching must be installed at a slope to ensure that sewage spills back into the channel and to prevent sedimentation, which can lead to blockages.
Step 4
Recommend ONE type of brick that can be used to build the walls of the manhole.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Common bricks can be used to build the walls of the manhole due to their durability and resistance to moisture.
Step 5
Draw the sectional front view by projecting it from the given top view. Show FIVE brick courses.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct sectional front view will show a detailed arrangement of five brick courses in stretcher bond, with hatching to indicate brickwork.
Step 6
Name the type of soil where this type of shore will be used.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The type of soil where this shore is used is moderately firm ground.
Step 7
Identify A and B.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A is identified as Poling boards or planks, and B is identified as Strut.
Step 8
Name the safety equipment that will be appropriate.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Appropriate safety equipment includes a respirator or breathing apparatus to protect workers from inhaling hazardous materials.
Step 9
Describe THREE regulations that must be adhered to when workers work in high places.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Appoint a competent person responsible for the preparation of a fall plan.
Ensure that a fall protection plan is implemented, amended when necessary, and maintained as required.
Ensure that steps are taken to continue adherence to the fall protection plan to safeguard workers.
Step 10
Calculate the number of bricks needed for the partition wall, excluding breakage. Ignore the openings.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the number of bricks needed:
Total length of the partition wall = 760 mm.
Area of partition wall = 0.76 m x 1.2 m = 0.91 m².
Each brick covers approximately 0.0455 m², thus:
ext{Number of bricks} = rac{0.91}{0.0455} ext{ (including breakage)}
